(2011), and describes in detail the geochemistry and isotope systematics of some regions within bone 22799-D, disturbed by one or more post-fossilization uranium-enrichment events.
The discussions in that paper clearly demonstrate that the low Pb domains typically do preserve dates in accordance with the well-constrained depositional age of the host rock, and thus provide an accurate estimate of the fossilization date.
(2012), the Pb-method is the well-established and preferred method for making such corrections in sample materials that contain abundant common lead using in-situ ion beam and laser ablation techniques (e.g., Williams, 1998; Storey et al., 2006).
A manuscript now in preparation by Heaman, Simonetti, and Fassett (Heaman, 2012, personal commun.) will provide a more detailed description of the procedures used by Fassett et al.
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